Undefined Symbols for architecture x86 64 Compiling problems

Question

So I am trying to start an assignment  my professor gives us a Main cpp  Main h  Scanner cpp  Scanner h  and some other utilities   My job is to create a Similarity class to compare documents using the cosine and Jaccard coefficients  However  I can not seem to get the project linked correctly  therefore I am unable to start on the actual code   After trying for several hours to see what I am doing wrong  I need fresh eyes to see what I am doing wrong  I suspect it is obvious   Here is the Main cpp   include  Main h   using namespace std   static const string TAG    Main      int main int argc  char  argv        string inStreamName    string logStreamName    string outStreamName     ofstream outStream    string timeCallOutput    Scanner inStream     Similarity similarity                                                                          Boilerplate for naming files and opening files   Utils  CheckArgs 3  argc  argv   infilename outfilename logfilename      outStreamName   static cast lt string gt  argv 2      logStreamName   static cast lt string gt  argv 3       Utils  FileOpen outStream  outStreamName     Utils  LogFileOpen logStreamName      timeCallOutput   Utils  timecall  beginning      Utils  logStream  lt  lt  timeCallOutput  lt  lt  endl    Utils  logStream  lt  lt  TAG  lt  lt   Beginning execution   lt  lt  endl     Utils  logStream  lt  lt  TAG  lt  lt   outfile     lt  lt  outStreamName  lt  lt       lt  lt  endl    Utils  logStream  lt  lt  TAG  lt  lt   logfile     lt  lt  logStreamName  lt  lt       lt  lt  endl    Utils  logStream flush                                                                            What follows here is the real work of this code         read the entire input file and echo it back        compute the two similarity coefficients    inStreamName   static cast lt string gt  argv 1      inStream openFile inStreamName     Utils  logStream  lt  lt  TAG  lt  lt   infile     lt  lt  inStreamName  lt  lt       lt  lt  endl    Utils  logStream flush       similarity readData inStream      outStream  lt  lt  TAG  lt  lt   Data Begin n   lt  lt  similarity toString    lt  lt  endl    outStream  lt  lt  TAG  lt  lt   Data End n   lt  lt  endl    outStream flush      inStream close       outStream  lt  lt  TAG  lt  lt   Begin similarity computation   lt  lt  endl    outStream  lt  lt  TAG  lt  lt   Maximum Jaccard similarity  n   lt  lt                         similarity maxJaccard    lt  lt  endl    outStream  lt  lt  TAG  lt  lt   Maximum cosine similarity  n   lt  lt                         similarity maxCosine    lt  lt  endl    outStream  lt  lt  TAG  lt  lt   End similarity computation   lt  lt  endl    outStream flush                                                                            Boilerplate for terminating gracefully   Utils  logStream  lt  lt  TAG  lt  lt   Ending execution   lt  lt  endl    timeCallOutput   Utils  timecall  ending      Utils  logStream  lt  lt  timeCallOutput  lt  lt  endl    Utils  logStream flush       outStream flush      Utils  FileClose outStream      Utils  FileClose Utils  logStream      return 0      And the Main h   ifndef MAIN H  define MAIN H   include        Utilities Utils h   include        Utilities Scanner h    include  Similarity h   class Main   public    int main      virtual  Main     private        endif    MAIN H   My Similarity cpp   include  Similarity h   using namespace std   void readData Scanner amp  inStream      string maxCosine        return  cosine      string maxJaccard        return  jaccard      string toString        return  toString       And finally my Similarity h    ifndef SIMILARITY H  define SIMILARITY H   include        Utilities Scanner h   class Similarity   public      Similarity        virtual  Similarity         void readData Scanner amp  inStream       string maxCosine        string maxJaccard        string toString    private        endif   When I use the makefile he provided  and the one I have to use in order for his script to work to grade it I get this error   g   -O3 -Wall -o Similarity o -c Similarity cpp g   -O3 -Wall -o Aprog Main o Similarity o Scanner o ScanLine o Utils o  Undefined symbols for architecture x86 64     Similarity  maxJaccard     referenced from         main in Main o    Similarity  readData Scanner amp     referenced from         main in Main o    Similarity  toString     referenced from         main in Main o    Similarity  maxCosine     referenced from         main in Main o    Similarity  Similarity     referenced from         main in Main o    Similarity   Similarity     referenced from         main in Main o ld  symbol s  not found for architecture x86 64 collect2  ld returned 1 exit status make       Aprog  Error 1   Thank you for reading through all that  any suggestions or solutions would be greatly appreciated

User · Accepted Answer

There s no mystery here  the linker is telling you that you haven t defined the missing symbols  and you haven t   Similarity  Similarity   or Similarity   Similarity   are just missing and you have defined the others incorrectly   void Similarity  readData Scanner amp  inStream       not  void readData Scanner amp  inStream       etc  etc   The second one is a function called readData  only the first is the readData method of the Similarity class   To be clear about this  in Similarity h  void readData Scanner amp  inStream     but in Similarity cpp  void Similarity  readData Scanner amp  inStream

[c++] Undefined Symbols for architecture x86_64: Compiling problems

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